fn main() {
    let mut numbers: [u8; 4] = [1, 2, 3, 4];
    let all = &numbers[..];
    println!("All of them: {all:?}");

    let first_two = &mut numbers[0..2];
    first_two[0] = 100;
    first_two[1] = 99;

    println!("Look ma! I can modify through slices: {numbers:?}");
}